Cryptography
Cryptography is the science of encoding a message into a form that is unreadable and making sure only the proper people are capable of decoding the message back into its original form. This is usually done by using an encryption algorithm and a decryption algorithm (these two are often the same) and very often a secret key. Some of the early cryptographic systems did not use a key but instead kept the algorithm itself secret. The message sender uses the encryption algorithm and the key to encode the message, and then sends it to the receiver. The receiver then uses the decryption algorithm and the key to turn back the encrypted message into its original form and read it. If the message is intercepted others, they will only have unreadable data and will have gained nothing, unless they can figure out the decryption algorithm and obtain the key. This is why the key is never to be sent with the message, and has to be kept secret at all cost. If the key is compromised, the sender and the encrypted data is no longer safe. The sender and the receiver then usually agree on a new key to prevent any further damage. In ancient Greece, around 550 Bc, messages were sent encoded to generals and could only be decoded using special
Without the use of encryption, broadcasting a premium channel would be stupid. For businesses, the only safe way to communicate through a medium where each single bit they send can be listened to is to encrypt all of their communications with a cipher strong enough to resist breaking attempts from the other businesses. In this algorithm, each letter correspond to another letter but in no particular order. Bibliography Dont remember =(. It consisted simply of switching each letter with the letter that was 3 letters further down the alphabet. In France during 1585, members of the king's court liked to send romantic or gossip messages to each other and encrypt them for safety, which becomes almost a necessity. For example "Stephen" would become "Vwhskhq". Blaise de Vigenere came up with a poly-alpabetic substitution known as the Vigenere cipher. What this means is that it is illegal to export it to another country in any way. Also, the government is now trying to impose the Clipper chip as a standard on all computers, and banning all other forms of cryptography, in order to have a unique cryptographic system which it has the ability to break. Furthermore, prohibiting US companies from being able to export strong cryptography results in loss of marketing opportunities for them. Many government agencies takes this matter very seriously. Cryptography will prove to be important in the present and future by ensuring that credit card numbers stay secure over the Internet. It had different wheels of different sizes which were to be tuned differently depending on the date, the different turnings were listed in a little booklet that came with the machine.
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